So far, so good.
Yahoo's email wants you to download it to make their product work better. The jury's still out on that one.
Well, I use yahoo for my email, so I guess I got sucked up in that.
But it seems to be working well, save possibly for Wordpress, which is what my stepson used to put together my web site. I'm having problems with that, but to be fair, I'm also having problems with Wordpress in Explorer, so I dunno.....